Abstract
The P53N gene maps precisely to human chromosome sub-band 22q12.1-12.3, a region where loss of heterozygosity has been reported in 30% of astrocytic tumors and associated with progression to anaplasia. Moreover, a putative tumor suppressor gene has been indicated on 22q11 region involved in pathogenesis of ependymal tumors. Our objectives to examine the expression level of novel membrane-associated protein (termed P53N) encoded by a novel human gene on chromosome 22q12.1-12.3 in glioblastomas and ependymomas. Serial analysis of gene expression (SAGE) and immunofluorescence analysis of the P53N in the brain tumor tissues were performed. Our analysis revealed that there was high expression of the P53N mRNA in brain ependymoma and brain well-differentiated astrocytoma libraries. The P53N protein. P53N protein contains a high mobility group (HMG) domain at amino acid positions 301 to 360 expressed highly in glioblastoma and ependymoma specimens. Anti-P53N carboxyl-terminal peptide antibody localized the P53N protein to the cytoplasmic membranes of protoplasmic astrocytes in the glioblastoma and ependymoma specimens. These results are in good agreement with the SAGE analysis and the predicted transmembrane topology for the P53N protein and support a possible transmembrane model in which the P53N contains a predicted transmembrane region with its amino terminus localized to the inside of the cytoplasmic membrane.
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Acknowledgements
We thank Chiang Wang, Ph.D., for assisting Dr. Bruce M. Frankel. We also thank Sigma Genosys for the generation of the anti-P53N carboxyl-terminal peptide antibody.
Funding
This study was partially supported in part by the NIH sponsored grants to Bruce M. Frankel (1R01FD003542-01), Departments of Neurosurgery and Urology at the University of Tennessee Health Science Center, the Assisi Foundation of Memphis, and a grant from the American Brain Tumor Association (to BMF).
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Conceived and designed the experiments: BMF. Analyzed the data: BMF. Wrote the draft of the manuscript: BMF, AD, and DC. Contributed to the writing of the manuscript: BMF, AD, SJP, and DC (all authors). Agree with manuscript results and conclusions: all authors. Jointly developed the structure and arguments for the paper: all authors. Made critical revisions and approved final version: BMF. All authors reviewed and approved of the final manuscript.
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Frankel, B.M., Cachia, D., Patel, S.J. et al. Analysis of the P53N a Novel Protein Encoded on Chromosome 22q12.1-12.3 in Glioblastomas and Ependymomas Specimens. J Mol Neurosci 71, 1714–1722 (2021). https://doi.org/10.1007/s12031-021-01808-8
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DOI: https://doi.org/10.1007/s12031-021-01808-8